Считывание данных с консоли

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StreamTokenizer;
import java.io.Writer;
import java.util.Stack;
 
public class T1001 {
 
    public static void main(String[] args) throws IOException {
        boolean oj = System.getProperty("ONLINE_JUDGE") != null;
        Reader reader = oj ? new InputStreamReader(System.in, "ISO-8859-1") : new FileReader("input.txt");
        Writer writer = oj ? new OutputStreamWriter(System.out, "ISO-8859-1") : new FileWriter("output.txt");
        PrintWriter out = new PrintWriter(writer);
        StreamTokenizer in = new StreamTokenizer(new BufferedReader(reader));
        Stack<Double> stack = new Stack<Double>();
        while (in.nextToken() != StreamTokenizer.TT_EOF) {
            if (in.ttype == StreamTokenizer.TT_WORD) {
            } else if (in.ttype == StreamTokenizer.TT_NUMBER) {
                stack.push(Math.sqrt(in.nval));
            }
        }
        do {
            out.println(stack.pop());
        } while (!stack.empty());
        out.flush();
    }
}